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kernel crashed when probe_start failed

 I use latest systemtap to probe multiple function, and system will crash if register_kprobe for one function fails. I checked systemtap source code, in function _stp_handle_start(), if probe_start( ) return < 0, _stp_exit_called will  be equal 1. So that _stp_kill_time will never be called in function _stp_cleanup_and_exit(), but _stp_init_time is ever called.

Hence system will crash because register timer handler is freed when module exits. Kernel oops like this:

_stp_transport_init:274 transport_init from 4364 4365

_stp_proc_write_cmd. count:28 type:4

_stp_transport_open:229 stp_transport_open: 0 Mb buffer. target=0

_stp_transport_open:234 transport_mode=1

_stp_proc_write_cmd. count:8 type:5

_stp_handle_start:97 stp_handle_start pid=5

timer handler function is f8b518ab

ERROR: dwarf probe kernel.function("atomic_notifier_call_chain@kernel/sys.c:225"

) registration f_stp_cleanup_and_exit:130 cleanup_and_exit (0)

ailed, rc=1

_stp_transport_close:199 ************** transport_close *************

_stp_cleanup_and_exit:130 cleanup_and_exit (1)

_stp_transport_close:209 ---- CLOSED ----

BUG: unable to handle kernel paging request<1>BUG: unable to handle kernel pagin

g request at virtual address f8b518ab

printing eip:


*pde = 017f7067

*pte = 00000000

Oops: 0000 [#1]


Modules linked in: binfmt_misc e1000 e100 ext3 jbd

CPU: 1

EIP: 0060:[<f8b518ab>] Not tainted VLI

EFLAGS: 00010286 (2.6.18-rc7ia32 #4)

EIP is at 0xf8b518ab

eax: 00000000 ebx: 00000100 ecx: f7ea1f48 edx: f7ea0000

esi: f7e0a000 edi: f8b518ab ebp: 00000001 esp: f7ea1f44

ds: 007b es: 007b ss: 0068

Process swapper (pid: 0, ti=f7ea0000 task=f7e82550 task.ti=f7ea0000)

Stack: c0125f03 f7ea1f48 f7ea1f48 00000011 c03dcb08 0000000a c0122208 00000046

00000000 00000000 00000000 c012229f f7ea0008 c01037ef f7ea0008 00000000

00000000 00000000 00000000 00000000 00000000 0000007b c011007b ffffff10

Call Trace:

[<c0125f03>] run_timer_softirq+0xfa/0x14f

[<c0122208>] __do_softirq+0x5a/0xbb

[<c012229f>] do_softirq+0x36/0x3a

[<c01037ef>] apic_timer_interrupt+0x1f/0x24

[<c011007b>] acpi_copy_wakeup_routine+0x1b/0x9a

[<c0101b8a>] mwait_idle+0x25/0x38

[<c0101b4b>] cpu_idle+0x9f/0xb9

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